a bus driver and a child are dead after a school bus crashed into a bridge in indiana. two other children are critically injured. police say internet users told them a university of maryland student was threatening a shooting rampage planned for today. a 19-year-old was arrested on sunday. >>> and the fbi says a domestic dispute may have been behind a bomb scare on board a jet blue flight earlier. a caller said there wasa threat. back to "hardball." >>> welcome back to "hardball." of course, the terrible news out of afghanistan this weekend was horrific. early sunday, a sergeant in the u.s. army allegedly slipped off the base in southern afghanistan, walked more than a mile, and stalked from home to home in several afghan villages, killing at least 16 civilians. 9 of the dead were children, very young children. it's one of the worst atrocities committed so far in the afghan war, obviously, and it raised all kinds of questions, not the least of which is why this soldier did what he did, and then what are we doing there? there's also a question of whether or not this is a